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I used the Gyeon View coat 3 years ago. They said it would have a durability of 1 year. But i can say, during hard rain and driving more than 80km/h, i still don't need to use the wipers. The drops flow still off my windscreen, like i applied a new coat on it.
I tried before Rain-X, but it didn't work for me at all. Even at high speeds it didn't do to much
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